Story continues“Any use of chemical weapons will totally change the nature of the conflict,” Stoltenberg said. That could include, for instance, incorporating under his command a Czech battalion that specializes in so-called CBRN threats, a NATO official said. Biden noted that President Volodymyr Zelenskiy addressed the NATO leaders by videoconference on Thursday. Biden, speaking at the White House Wednesday, said there’s “a real threat” that Russia will use chemical weapons. NATO officials are studying different scenarios around Russia’s possible use of chemical agents as weapons of mass destruction, alliance officials said.